A good idicator of a blocked radiator is if when the car is at temp the top RAd hose is hot and the bottom one isnt as hot.

Put a highflow thermostat in yesterday and a new radiator cap, put dash in dignostic mode thing then went for a drive, was heating up to 93 (little over half way on my gauge) then instantly cooling down to 84ish (quater on gauge) but not sure why its heating up that much in 12 degree mornings after 5 min of driving, cheers hope it helped

Could just be the temp gauge? My mates ef gets hot in traffic aswell but it prob your fan playin up although does it lose coolant? My car was gettin really hot and turns out i had a leak in a heater hose

Could do with a good flush i may not be blocked but there could be air in the hoses?